819031817808 has 120 divisors (see below), whose sum is σ = 2434318675776. Its totient is φ = 256174617600.

The previous prime is 819031817797. The next prime is 819031817843. The reversal of 819031817808 is 808718130918.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 304893 + ... + 1315683.

Almost surely, 2^819031817808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 819031817808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1217159337888).

819031817808 is an abundant number, since it is smaller than the sum of its proper divisors (1615286857968).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

819031817808 is a wasteful number, since it uses less digits than its factorization.

819031817808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1011153 (or 1011144 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 54.

The spelling of 819031817808 in words is "eight hundred nineteen billion, thirty-one million, eight hundred seventeen thousand, eight hundred eight".